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Refs #18991

Add a new parameter: psz_flatpath. If not NULL, readdir_helper_additem() will
un-flatten the folder hierarchy. It will create an input item for each sub
folders (separated by '/') of psz_nullpath.

Example: a stream directory that have the following items:
 - "foo/bar/item1"
 - "foo/bar/item2"

will output the following items while using this new parameter:
 - foo
   - bar
     - item1
     - item2

This functionality can be used by "stream directory" modules that have a
flattened folder hierarchy, like libarchive.

Access modules should not need this functionality.

This helper can now be used by other modules like "stream directory".

Signed-off-by: Thomas Guillem <thomas@gllm.fr>

They have been identical for a while.

This matches the stream_t.pf_read convention.

login is valid only if vlc_credential_get returned true

The first sort argument is no longer necessary.

This commit changes pf_readdir callback to its original behavior. Accesses and
streams now add items to a node.

Archive stream_filters will now be able to add nodes to a node (when an archive
has directory). This was not possible before.

This commit also adds an access_fsdir helper to help fs accesses (file, smb,
nfs, ftp, sftp) adding items to a node. These accesses need the same treatment
that is now done by this helper:
 - hide hidden files or not (depending on "show-hiddenfiles" option)
 - skip some file extensions (depending on "ignore-filetypes" option)
 - sort items by type and alphabetically (depending on "directory-sort"
   option).
 - For a next commit: attach slaves to items

The directory demux won't do these operations anymore for every access/stream.

This commit doesn't change the interruptible state of the pf_readdir function,
accesses/streams are still interruptible in the middle of a pf_readdir call.

This partially reverts commit 88ffe158.

Remove "int options, const char *const *options, unsigned option_flags"
arguments from every New() functions since these args are mainly unused. You
now have to call input_item_AddOptions after input item creation to add
options.

Add input_item_net_type enum in order to avoid confusion between 2 int
arguments: i_duration and i_net that could both be -1, 0 or > 0.

Replace input_item_NewWithType and input_item_NewWithTypeExt with
input_item_NewExt.

Add input_item_NewCard, input_item_NewDisc, input_item_NewStream,
input_item_NewDirectory, input_item_NewFile MACRO. These MACROS avoid to use
useless arguments for an item type (for example, it's useless to specify a
duration for a directory type).

Don't decode url before parsing it. psz_share and psz_path are now stored on
the same allocated and decoded string.

libdsm functions return now a negative number in case of error. Add NT_STATUS
error check to detect permission errors in order to ask for credentials only in
that case.

This keystore is used to store credentials on memory if no others keystore is
found or if the user doesn't want to store them permanently. This keystore is
owned by libvlc and is shared with all vlc objects. It's released when the
libvlc instance is released.

cid #1352643a

 - Never save guest credentials
 - Don't save password in options if it's in the keystore

This reverts commit 76ae877d.